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2.4 PSA Operation Heavy Product t Heavy Product Feed Feed Depressurization Light reflux Pressurization Adsorption Conditions need to be matched at these boundaries Pressurization Adsorption Depressurization Light reflux x x Bed 2 Bed 1 Light Product Light Product t Feed Feed Heavy Product Heavy Product CSS CSS Figure 2.5: Boundary matchings required for the two-bed four-step PSA process constant and repeats itself invariably from cycle to cycle. Mathematically, CSS is represented by matching the inital conditions of the PDEs with the solution obtained at the end of the cycle. Thus, we note that the initial conditions required to solve the set of PDEs of a PSA process are themselves parametric and should be computed simultaneously with the solution of PDEs. The number of cycles required by an actual PSA process to go from start-up to CSS are system dependent, but typically quite large. For instance, the number of cycles required to reach CSS are around 500 for H2 PSA while 2000 for O2 VPSA process [114]. Normally, CSS is determined by solving the PDE system repeatedly for each step of the cyclic process in sequence, using the final concentration profile for each step as the initial condition for the next step in the cycle. Such computations are bulky since the procedure is repeated sufficiently for a large number of cycles. 2.4.3 Boundary-matching for Multi-bed Operation In a multi-bed PSA operation, beds interact with each other over the cycle as material flows from one bed to another, such as during the reflux and pressure equalization steps. We need to capture such an interaction at the boundary of the beds while simulating the multi-bed system. Chapter 2. Pressure Swing Adsorption 25PDF Image | Design and Operation of Pressure Swing Adsorption Processes
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